#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int is_leap_year(int x)
{
	if (x / 4 == 0 || x / 100 != 0)
		return 1;
	else if (x / 400 == 0)
		return 1;
	else
		return 0;
}
int main()
{
	int year = 0;
	for (year = 1000; year <= 2000; year++)
	{
		if (is_leap_year(year))
		{
			printf("%d", year);
		}
	}
	return 0;
}